Dual density polyurethane sole. It has an orthotic bottom with an infused flat proprioceptive honeycomb upper. The straps are made from high-quality flexible PVC to provide a tight fit to prevent ‘toe crunching’, a health issue that can occur with wearing normal flip flops long term. The straps will provide some stretch with use to fit snuggly to your feet. There is 6 months warranty on the e-bed™ and 1 month on the straps when the product purchase is registered. See FAQs We distribute globally from India. International freight is a rising cost. equilibras™ FOOTWEAR chooses to absorb the majority of this cost.